Donald Trump.
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Donald Trump's new senior communications adviser had bashed the real-estate mogul on Twitter in a series of now deleted tweets.

Jason Miller, who formerly worked for Texas Sen. Ted Cruz, mocked the Manhattan billionaire on several occasions, referring to him as "#SleazyDonald."

The tweets from Miller were dated as recently as early May, when Trump clinched the GOP nomination.

Miller was officially announced as a new hire in a Trump campaign release on Tuesday morning.

"Mr. Miller will work with several areas of the campaign to ensure messaging coordination and implementation," the release said. "Mr. Miller has managed campaigns and shaped messages for successful House, Senate, and gubernatorial races in addition to serving on the senior staffs of two presidential campaigns."

In a pair of the now deleted tweets, first flagged by the liberal blog ThinkProgress, Miller called Trump "the Carl Lewis of flip-flopping" after the real-estate magnate made controversial statements in late March regarding abortion rights. He later asked "which lobbyist wrote Donald Trump's foreign policy speech today" after Trump delivered an address in late April.

It is unclear if the Trump campaign was aware of the tweets, and a representative did not return a request for comment from Business Insider.